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function stickyNav() {
  var footer = $("footer");
  var pos = footer.position();
  var height = $(window).height();
  height = height - pos.top;
  height = height - footer.height();
  if (height > 0) {
    footer.css({'margin-top' : height+'px'});
  }
}

$(window).bind("load resize", stickyNav);